Effect of Sodium Aluminate on Initial Hydration of Amorphous Calcium Aluminate

摘要

For materials design of the accelerator, it is important to analyze the hydration reaction of the accelerator. Accordingly, the effect of sodium aluminate, which is a typical component substance of the accelerator, on the initial hydration was investigated. The hydration reaction of amorphous calcium aluminate, which is a kind of calcium aluminate compounds, significantly depends on the addition of sodium aluminate. Sodium aluminate inhibited the hydration of amorphous calcium aluminate. This phenomenon was supposed that the sodium aluminate provide on the surface of amorphous calcium aluminate particles with aluminum hydroxide ion, which create gel hydration products. In addition, it was proven that increasing the calcium ion concentration could prevent hydration inhibition.